OT : Windows-email question:please respond of list!

["John Longland" <johnl@xxxxxxxxxxxxxx>]

hi

My apologies to do this again.

I am once again pulling my hair out with windows.

Setup:

15 clients using Outlook.
2 servers : one handling internal mail ( Microlsoft Mail)
	    one server is a LINUX box used as a gateway and E-mail server.

On the Outlook client I have 2 services : one for internal mail and the
other for E-mail.
They point to their respective servers.
I have 1 client that suddently started giving errors:

When sending E-mail:
	No transport provider was available for delivering to this recipient

What I have done / checks performed:

pinging : client can see all servers / server can see client
I can telnet from the client.
The internal mail via the NT server functions.
I removed TCP/IP stack and replaced it.
i have removed the service within Outlook and replaced it.
The logs on the LINUX mail server reflects a successfull login / logout by
the
user to send / receive E-mail
I used a MS technet printout to check 9 possible causes for this. They all
check out.

HELP !!      I AM DROWNING !


Sorry to post this on our LINUX list, but it seems LINUX people knows the
most about
Windows !!

Tnx !!!

John